Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9473dbb2aa2594e…

MALICIOUS

PDF

66.7 KB Created: 2020-12-25 10:23:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2e1aa6d7e0c03976d91608f2dd06bdb7 SHA-1: 9aafd939a51e718d2c3b100ad5411a26bce9a8d8 SHA-256: b9473dbb2aa2594e3ca34805c0563b2de09498a4ffffd7ae25598348458261ab
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/strik?utm_term=stick+hero+fight PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5f8f41478a01e.pdfIn PDF document text
    • https://siradukezud.weebly.com/uploads/1/3/4/7/134711866/pezudomapaju_woveno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f96f836180e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475392/normal_5fafbdc149e9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_5fc1337b4304f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_5fd128d1e720b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_5f9f16893bb59.pdfIn PDF document text
    • https://womarunere.weebly.com/uploads/1/3/4/3/134315700/2764143.pdfIn PDF document text
    • https://zegimobigew.weebly.com/uploads/1/3/4/3/134313375/rekavonu-risonuzilamaze-ziwivadolitak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5fd352aa1950e.pdfIn PDF document text
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/62a6c0c52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408348/normal_5f97999da36e8.pdfIn PDF document text
    • https://newomuzupigew.weebly.com/uploads/1/3/4/4/134468212/xibokewusesurep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/34072603754.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/iran_revolution_crash_course_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 4892 bytes
SHA-256: e410b41ff7cd38c432b18bc7d06010b8bafd311e6ad41e5ccdfb2dc4d9604b91
font_01_sfnt_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 10968 bytes
SHA-256: 359ee3cd2428fd8c791dcb6d868a251f5a18ae86c031811f940cc642b4e2daf8

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